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1
Content available Performance of four different nanoparticles in boundary layer flow over a stretching sheet in porous medium driven by buoyancy force
Ammani Kuttan B., Manjunatha S., Jayanthi S., Gireesha B. J.
International Journal of Applied Mechanics and Engineering
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2020
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Vol. 25, no. 2
1--10
EN
This contemporary work explores the theoretical analysis of energy transfer performance of distinct nanoparticles (silver, copper, aluminium oxide and titanium oxide) adjacent to a moving surface under the influence of a porous medium which is driven by the buoyancy force. A mathematical model is presented which is converted to similarity equations by employing similarity transformation. The condensed nonlinear equations were approximated by the iterative method called RKF 45th-order. The flow and energy transference characteristics are explained through graphs and tabulated values. The notable findings are: silver- water is an appropriate nanofluid for enhancing the thermal conductivity of the base fluid. Titanium oxide – water shows a lower fluid flow movement due to porosity.
2
Content available Effect of convective heat and mass conditions in magnetohydrodynamic boundary layer flow with joule heating and thermal radiation
Sharma R. P., Tinker Seema, Gireesha B. J., Nagaraja B.
International Journal of Applied Mechanics and Engineering
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2020
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Vol. 25, no. 3
103--116
EN
A free convection viscous MHD flow over a semi-infinite vertical sheet with convective heat and mass conditions has been considered. The effects of thermal radiation, chemical reaction and Joule heating on flow are also accounted. The governing nonlinear partial differential equations have been transformed into a set of highly non-linear coupled ordinary differential equations (ODEs) using appropriate similarity transformations. Numerical solutions of transformed equations are obtained by employing the 5th order Runge-Kutta Fehlberg technique followed by the shooting technique. The influences of different flow parameters on the momentum, energy and mass field are discussed and shown graphically. Results reveal that temperature and concentration profiles enhance due to increasing heat and mass Biot number parameters.
3
Content available An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet embedded in a porous medium
Kumar K. G., Gireesha B. J., Rudraswamy N. G., Krishnamurthy M. R.
International Journal of Applied Mechanics and Engineering
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2019
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Vol. 24, no. 2
245--258
EN
An unsteady flow and melting heat transfer of a nanofluid over a stretching sheet was numerically studied by considering the effect of chemical reaction and thermal radiation. The governing non-linear partial differential equations describing the flow problem are reduced to a system of non-linear ordinary differential equations using the similarity transformations and solved numerically using the Runge–Kutta–Fehlberg fourth–fifth order method. Numerical results for concentration, temperature and velocity profiles are shown graphically and discussed for different physical parameters. Effect of pertinent parameters on momentum, temperature and concentration profiles along with local Sherwood number, local skin-friction coefficient and local Nusselt number are well tabulated and discussed.
4
Content available Scrutinization of Joule heating and viscous dissipation on MHD flow and melting heat transfer over a stretching sheet
Kumar K. G., Gireesha B. J., Manjunatha S.
International Journal of Applied Mechanics and Engineering
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2018
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Vol. 23, no. 2
429--443
EN
The present paper deals with an analysis of the combined effect of Joule heating and viscous dissipation on an MHD boundary layer flow and melting heat transfer of a micro polar fluid over a stretching surface. Governing equations of the problem are transformed into a set of coupled nonlinear ordinary differential equations by applying proper transformations and then they are solved numerically using the RKF-45 method. The method is verified by a comparison with the established results with limiting solution. The influence of the various interesting parameters on the flow and heat transfer is analyzed in detail through plotted graphs.
5
Content available Thermal analysis of generalized Burgers nanofluid over a stretching sheet with nonlinear radiation and non uniform heat source/sink
Kumar K. G., Ramesh G. K., Gireesha B. J.
Archives of Thermodynamics
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2018
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Vol. 39, no 2
97--122
EN
The work deals with the heat analysis of generalized Burgers nanofluid over a stretching sheet. The Rosseland approximation is used to model the non-linear thermal radiation and incorporated non-uniform heat source/sink effect. The governing equations reduced to a set of nonlinear ordinary differential equations under considering the suitable similarity transformations. The obtained ordinary differential equations equations are solved numerically by Runge-Kutta-Fehlberg order method. The effect of important parameters on velocity, temperature and concentration distributions are analyzed and discussed through the graphs. It reveals that temperature increases with the increase of radiation and heat source/sink parameter.
6
Content available Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
Archana M., Gireesha B. J., Rashidi M. M., Prasannakumara B. C., Gorla R. S. R.
Archives of Thermodynamics
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2018
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Vol. 39, no 4
33–-57
EN
Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
7
Content available Thermal analysis of a fully wet porous radial fin with natural convection and radiation using the spectral collocation method
Khani F., Darvishi M. T., Gorla R. S. R., Gireesha B. J.
International Journal of Applied Mechanics and Engineering
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2016
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Vol. 21, no. 2
377--392
EN
Heat transfer with natural convection and radiation effect on a fully wet porous radial fin is considered. The radial velocity of the buoyancy driven flow at any radial location is obtained by applying Darcy’s law. The obtained non-dimensionalized ordinary differential equation involving three highly nonlinear terms is solved numerically with the spectral collocation method. In this approach, the dimensionless temperature is approximated by Chebyshev polynomials and discretized by Chebyshev-Gausse-Lobatto collocation points. A particular algorithm is used to reduce the nonlinearity of the conservation of energy equation. The present analysis characterizes the effect of ambient temperature in different ways and it provides a better picture regarding the effect of ambient temperature on the thermal performance of the fin. The profiles for temperature distributions and dimensionless base heat flow are obtained for different parameters which influence the heat transfer rate.
8
Content available Effect of electric field on dispersion of a solute in an MHD flow through a vertical channel with and without chemical reaction
Umavathi J. C., Kumar J. P., Gorla R. S. R., Gireesha B. J.
International Journal of Applied Mechanics and Engineering
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2016
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Vol. 21, no. 3
683--711
EN
The longitudinal dispersion of a solute between two parallel plates filled with two immiscible electrically conducting fluids is analyzed using Taylor’s model. The fluids in both the regions are incompressible and the transport properties are assumed to be constant. The channel walls are assumed to be electrically insulating. Separate solutions are matched at the interface using suitable matching conditions. The flow is accompanied by an irreversible first-order chemical reaction. The effects of the viscosity ratio, pressure gradient and Hartman number on the effective Taylor dispersion coefficient and volumetric flow rate for an open and short circuit are drawn in the absence and in the presence of chemical reactions. As the Hartman number increases the effective Taylor diffusion coefficient decreases for both open and short circuits. When the magnetic field remains constant, the numerical results show that for homogeneous and heterogeneous reactions, the effective Taylor diffusion coefficient decreases with an increase in the reaction rate constant for both open and short circuits.
9
Content available Transient velocity and steady state entropy generation in a microfluidic Couette flow containing charged nano particles
Gorla R. S. R., Gireesha B. J.
International Journal of Applied Mechanics and Engineering
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2015
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Vol. 20, no. 4
787--804
EN
An analysis has been provided to determine the transient velocity and steady state entropy generation in a microfluidic Couette flow influenced by electro-kinetic effect of charged nanoparticles. The equation for calculating the Couette flow velocity profile is derived for transient flow. The solutions for momentum and energy equations are used to get the exact solution for the dimensionless velocity ratio and dimensionless entropy generation number. The effects of the dimensionless entropy generation number, Bejan number, irreversibility ratio, entropy generation due to fluid friction and due to heat transfer on dimensionless time, relative channel height, Brinkman number, dimensionless temperature ratio, nanoparticle volume fraction are analyzed.
10
Content available Mixed convection in the stagnation-point flow over a vertical stretching sheet in the presence of thermal radiation
Manjunatha S., Gireesha B. J., Bagewadi C. S.
International Journal of Applied Mechanics and Engineering
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2015
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Vol. 20, no. 4
871--888
EN
An unsteady two-dimensional stagnation-point mixed convection flow of a viscous, incompressible dusty fluid towards a vertical stretching sheet has been examined. The stretching velocity and the free stream velocity are assumed to vary linearly with the distance from the stagnation point. The problem is analyzed using similarity solutions. The similarity ordinary differential equations were then solved numerical by using the RKF-45 method. The effects of various physical parameters on the velocity profile and skin-friction coefficient are also discussed in this paper. Some important findings reported in this work reveal that the effect of radiation has a significant impact on controlling the rate of heat transfer in the boundary layer region.
11
Content available remote A study of two dimensional unsteady dusty fluid flow under varying temperature
Bagewadi C. S., Gireesha B. J.
International Journal of Applied Mechanics and Engineering
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2004
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Vol. 9, no 4
647-653
EN
A two-dimensional unsteady dusty fluid flow in the Frenet frame field system of the three-dimensional Euclidean space E3 is studied. Basic equations are decomposed into intrinsic forms and flow analysis is carried out by varying i) the velocities of dust and fluid in different directions, ii) the temperature of both the fluid and the dust cloud. The graphs for temperatures of dust with respect to time are plotted.
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